I think that the instructions are currently confusing with the addition of the unsigned apk. In all cases I've seen a non-rooted device can use an unsigned apk without any additional instructions. Additional instructions have traditionally been for signed apks.
In the unrooted device instructions, there is ambiguity as to which file to download. It simply references the file as "mod" when in fact there are two versions, signed and unsigned. There is also no mention of lucky patcher. I'd ask to please make the instructions more clear.
When I currently attempt to download and run the unsigned apk I am unable to open it as it says that the package cannot be parsed. I am doing this in ldplayer. I did not follow any of the instructions for unrooted devices as it was unclear whether those instructions were for the signed version or the unsigned version.
Concerning the list of features, the final bullet point makes a mention to read details for remaining features but does not show where the details are located. Scrolling through the remainder of the post reveals that the details are absent.